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A 51-year-old man agrees to have #2 residual root to be extracted for implant. Panoramic X-ray (Fig.1) and CT coronal section (Fig.2) show maxillary sinus mucocele (*). 上颌第二磨牙即种三个位点：中隔，颊侧窝，腭侧窝。个人选择中隔，而
Xin Wei, DDS, PhD, MS 1st edition 06/21/2019, last revision 04/22/2021